Percussive-tool front-end construction



jam. 22, 1924. 1,481,643

' F. A. JIMERSQN PERCUSSIVE TOOL FRONT END CONSTRUCTION Filed NOV, 26 1920 C INV EINTOR asset ram. 22, 12a

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ECIS A. JIMERSON, OF ATS, PENNSYLVANIA, ASSIGNO COMP, F JERSEY CITY,

PERCUSSIVE-TOOL FRONT-END CONSTRUCTTON.

Application filed November 26, 1920. 7 Serial Nb. 426,671. v

, g This invention relates to fluid actuated machines of the hammer type, but more particularly to an improved front end construction for core'breakers, coal picks, and

1 similar machines, having a working tool in the form of a steel provided-with a collared shank, adapted to extend into the cylinder in position to receive the impact blows of the hammer.

Means have heretofore been provided around the steel shank and between the fixed collar on the shank and the. enclosing barrel nut for cushioning the steel, and this cush- Y ioning means has usually been in the form of cated' within the barrel a spring, but such springs have been found to break and are short lived. It has furthermore been found to be practicably impossible to make springs of suitable sizes which will continuously withstand the severe shock to'which they are subjected with out weakening, and injury to the machines has resulted from such breakage, with the attendant delays in the work. The primary object of the present invens tion is to secure a simple and 'eflicient cushioning device which cannot break under all ordinary circumstances and will be long lived and save breakage and repairs. I have found thata bufi'er of some suitable elastic material other than metal, of which rubber may be taken as an example, has many advantages over a metallic spring. The buffer should be of some material which has substantially the qualities of comparatively soft pliable vulcanized rubber, rather than hard rubberand the material of the bufi'er should. have appreciable elasticity. The buflerwhether of rubber or other material, is 10- nut forming the front headfof the machine and forwardly of the fixed collar on the shank of the stee and a loose'meta'llic bufi'er collar is preferably arranged between the buffer and the said fixed collar on the shank of the steel.

, A washer may also be provided ahead of the louder and over the opening in the end of the barrel nut throughwhich the working and of the steel is passed in assembling the ,in this instance,

cushioning device are illustrated in one of their-preferred forms in the accompanying drawings in which- V hjigure- 1 is a longitudinal sectional elevation of the front end of a machine contaming the invention,

I Figure 2 is a side elevation, and I Figure 3 is a detail side view of a portion of the shank of. a steel illustrating one method of applying the bufier and washer to the shank.

Referring to this drawings, only so much of the front end of a fluid actuated machine a hammer typeis shown as will serve to illustrate the invention. In this instance a coal pick has been chosen to illustrate the invention, but the invention. applies equally well to corebreakers and similar machines. The cylinder A, of which only. the front end portion is shown, is adapted to receive the shank B of a steel forming the working tool, having a collar C. The shank extends through the sleeve D in'the cylinder into position to receive the impact blows of the the usual manner. The sleeve D surrounds the shank of the steel rearwardly of the collar C and extends into the cylinder, whereby the collar C has limited movement between the sleeve and collar F.

this instance loosely surrounds the shank of the steel forwardly of-the fixed collar C and.

ber of substantially the quality described, is

placed loosely. over the shank of the steel the loose col and is adaptedto contactwith lar F. In Figure 3, the bufi'er G is shown in position on the shank of the steel. The

use of -a bufl'er collar F is advisable in order.

to eliminate to a large extent the wear of the steel 0n the bufier, which would otherwise occur.

A split metallic louder washer H of sub stantially the same diameter as the normal fluid actuated hammer E in l T0 INGERSOLL-B I JERSEY, A CORPORATIQN 0F JERSEY.

A loose collar or thick heavy washer F in lift.

outside diameter of the bufler G, is placed on'the shank on the steel in front of the buffer, and in Figure 3 the buffer washer is shown in position on the shank in full lines, and is shown in dotted lines in the act of being placed on the shank. The split washer H is opened or forced apart as indicated in dotted lines and is thus sprung over the shank of the steel.

This bufi'er washer H is preferably split and punched with a shape to correspond to the form of cross section of the steel, so that it will hug the steel closely. This split washer H could be omitted'and is not a necessary, although a desirable part of the construction, inasmuch as the hole 5 in the front end K of the barrel nut L in the case of a coal pick is relatively small and does not need to be large enough to permit the fixed collar C of the steel to pass throu h as in the case of a tie tamper for instance in which the tamper steel is provided with an enlarged and broadened working end.

The barrel nut L forming the front head of the machine encloses the buffer collar F, the buffer G and the buffer washer H as illustrated particularly in Figure 1, and extends over the front end of the cylinder A.

The buffer washer H'between the buffer G and the end K of the barrel nut closes'the opening J in the end of the barrel nut and when the parts are assembled, rotects the bufler, and prevents the buffer rom becoming distorted and damaged by shock and pressure which might otherwise tendto force the material of the bufler through the aperture J. v v

The barrel nut L is preferably threaded onto the forward end of the cylinder A by means of the screw threads 0 and suitable means may be provided for retaining or looking the barrel nut in position after it is tightened, in this instance the inner edge of the barrel nut being provided with grooves or notches P adapted toreceive the bent end Q of a coiled spring R the other bent end S of which enters the notch T in the flange U on the cylinder A.

After the parts are assembled and the barrel nut L is attached and securely retained in position, the shock of the collar C of the steel upon the loose collar F is cushioned by the collar retaining .bufl'er G which has the double function of a cushioning and retaining device. The bufl'er washer H may have the double function of a retaining and protective device. This cushioning device has been found to operate satisfactorily and well, prolongs the life of the parts and does not need to be renewed except in occasional instances. 4

I claim: s

1. A. fluidactuated machine of the hamnier type, having a fluid pressure cylinder,

a working tool in the form of a steel havresists ing a collared shank adapted to extend into the cylinder in position to receive the 1mpact blows of the hammer, a collar loosely surrounding the shank of the steel forwardly of said fixed collar on the steel and adapted to receive the impact of the steel as it is driven forward, a sleeve surrounding the shank of the steel rearwardly of said fixed collar and extending into the cylinder, whereby the fixed collar on the steel has limited movement between the sleeve and loose collar, a collar retainin bufler loosely mounted on the shank of t e steel and adapted to contact with said loose collar and cushion the blow of the steel, a barrel nut forming a front head enclosing said bufler and collar and secured to the front end of the cylinder, the said barrel nut having an opening in its front end to permit the passage of the working end of the steel, and means for retaining the barrel nut in position on the cylinder.

2. A fluid actuated machine of the hammertype, havin .a fluid pressure cylinder, a working tool 1n the form of a steel having a collared shank adapted to extend into the cylinder in position to receive the impact blows of the hammer, a collar loosely surrounding the shank of the steel forwardly of said fixed collar on said steel and adapted to receive the impact of the steel as it is driven forward, a sleeve surrounding the shank of the steel rearwardly of said fixed collar andextending into the cylinder, whereby the collar on the steel has limited movement between the sleeve and the collar, :1 non-metallic elastic collar retaining bufl'er loosely mounted on the shank of the steel forwardly of said loose collar adapted to cushion the blow of the steel, a split metallic bufler washer in front of said buffer, a barrel nut enclosing said loosecollar, the buffer, and the washer, and extending over the front end of the cylinder, and

means for retaining said barrel nut in position on the cylinder.

3. A fluid actuated machine of the hamber type having a fluid pressure cylinder, a working tool in the form of a steel having a collared shank adapted to extend into the cylinder, in position to receive the impact blows of the hammer, a collar loosely surrounding the shank of the steel forwardly of said fixed collar on said steel and adapted to receive the impact of the steel as it is driven forward, a sleeve surrounding the shank of the steel rearwardly of said fixed collar and extending into the cylinder, whereby the collar on the steel has limited movement between the sleeve and loose collar, a non-metallic elastic collar retaining buffer loosely mounted on the shank of. the steel adapted to contact with the said loose collar and to cushion the blow of the steel, a split metallic buffer washer on the shank of the steel in front of said buffer, a barrel nut enclosing said collar, the buffer, and the washer, and extending over the front end of the cylinder, the Said barrel nut having an opening in its front end to permit the passage of the working end of the steel, and the butter washer forming a cover for said opening when the parts are assembled, and means for retaining the barrel nut in position on the cylinder.

4. A fluid actuated machine of the hammer type, having a fluid pressure cylinder, a working tool in the form of a steel having a collared shank adapted to extend into the cylinder in position to receive the impact blows of the hammer, a collar or heavy washer loosely surrounding the shank of the steel forwardly of said fixed collar on said steel, and adapted to receive the im pact of the steel as it is driven forward, a sleeve surrounding the steel and extending into the cylinder rearwardly of said collar,

whereby the collar on the steel has limited movement between said loose collar and sleeve, a non-metallic elastic collar retaining bufier loosely mounted on the shank of the steel, adapted to cushion the blow of the steel, a split metallic buffer washer on the shank of the steel in front of said bufier, a barrel nut enclosing said loose collar, the buffer and the washer, and extending over the front end of and removably secured to the cylinder, the said barrel nut having an openin in its front end to permit the passage o the working end of the steel, and the bufi'er washer forming a closure for said opening when the parts are assembled, and means comprising a coiled spring retained in the groove in the barrel nut and a notch in the cylinder for retaining the barrel nut in osition on the cylinder.

11 testimony whereof I have signed this specification.

FRANQIS A. JIMERSON. 

